Guitar



FIG. 1 is a top, front and left side perspective view of a guitar showing my new design with the broken line showing of the bridge, strings and tuning means being for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a rear elevational view thereof; and

FIG. 7 is a front elevational view thereof. 

The ornamental design for a guitar, as shown and described. 